Function Table Of - Sharp DX-361HM Service Manual

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IC1 VHiTDA8808/-1 (TDA8808T)
FUNCTION TABLE OF IC
Pin
Terminal
Function
No. Name
1 GCHF
Gain control input of HF amplifier. Current
output from HF amplitude detector
2 Vp Positive supply voltage
3 HFout HF amplifier and equalizer voltage output
4 DET HF detector voltage input
5 Sc
Starting up capacitor input
6 Si/RD
ani
off control (start input); ready signal
output (starting up procedure successful)
7 Beq Equalizer reference current input
8 Bgc
DC and LF gain control reference current
input
9 FOC START Focus normalizing circuit starting current
10*
PLLH
PLL on hold output
11 TL Track loss output
12 DaDS Drop out detector suppression input
13 Vext
Negative supply connection for FEand FElag
output stage; also substrate connection
14 LPF
Low pass filter for Iret, used in track loss
(T[) detector and LF gain control.
IC1 VHiTDA8808/-1 (TDA8808T)
Pin
Terminal
Function
No. Name
15
FE
Current output of normalized, switched
focus error signal
16 FElag
Current output of switched focus error
signal, intended for lag network
17
La
Laser amplifier current output
18 LM Laser monitor diode input
19 GCLF
Gain control input for AC and LF amplifiers.
Current output from LF amplitude detector
20 Re2
Summation of amplified currents from D3
and D4
21 Re1
Summation of amplified currents from D1
and D2
22,23 D1,D2
Current inputs to DC and LF photo diode
amplifier
24,25 D3,D4
Current inputs to DC and LF photo diode
amplifier
26 HFin
Current input to HF amplifier
27 GND Ground connection of device
28 DEC Decoupling input (internal bypass)
In this unit, the terminal with asterisked mark (*) is (open)
terminal which is not connected to the outside.
A
01
B
02
RE1
( ? 1 l < o - - - - - - - - - - . . . . I
R E 2 ( 3 j _ - - - - - - - - - - - . J
DEC VEXT
131)..- - - . . . ,
1--------l~10
PLLH
LASER STARTING
SUPPLY 10>----1 C I RCU [T
!4----{5 SC
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